Hand-tool.



B. B. DE MASTERS.

HAND TOOL.

APPLICATION FILED NOV. 20. I913- 1 ,21 6,663. Patented Feb. 20, 1917.

Ax i Wit/Lassa? fnbeidn fienflflefllasiers p v M rm: cal. PKOIU-LITHO WASNINcm/V n c BEN -12; DE MASTERS, or KANSAS CITY, MIssoUnI.

simian,

Toall whom it may concern. I 1

Be it knownthatI, BEN B. Dn M'As'rnns,

a citizen" of theUnited States, residing at Kansas City, in the county of Jacksonand State of Missouri, have invented certain'new and useful Improvements in Hand+Tools, of which the following is a specification. f t

This invention relates to improvements in tools for use principally in the grindingof valves of internal combustion engines, and

my special object is to devise ahand tool provided with a bit for engaging the valve and means for oscillating the bit,- whlch means will permit of convenient oscillation of the bit only through approximately a half revolution. It is also an object to produce a tool which'may be conveniently operated to manipulate valves or other parts as to pro hibit the use of other tools commonly em ployed for the purpose;

A further object is to provide a tool of few parts and hence of extremely simple be fully understood reference is to be had to the accompanying drawing, in which. Figure 1, is a side elevation of a tool embodying my improvements. 7

Fig. 2, is a longitudinal section of the i same.

Fig. 3, is a sectional detall of ELIIlOdlfiQd' form. I I

Referring to the drawing, the tool comprises a longitudinal member or post 2 on the head of which is secured a disk 4, the latter being fixed to the post by means of a pin 6 extending through a hub formed on one side of the disk. On the end of the post at the opposite side of said disk is journaled a sleeve 8, the end of the post being upset to retain said'sleeve in place, and a pressure blocklO is carried by said sleeve, being bored to fit the same in tight relation. r

J ournaled on the post 2 is a yoke 12 forming a crank arm provided with a hand grip 14 journaled on its mid portion. The lower journaled portion of the yoke is provided with a series of clutch teeth 16, adapted to clutch asimilar series of teeth 18 formed on the sleeve 20 which is secured to the post 2 sp ifi of Later; t nt .raanaareb. 20, 1917. Application filedNovenilier 20,1913. 'seria nasoaove. I

slot 24 in w'hich torsecure the shankofthe bit 26b} means of a cotter 28.

In the grinding ofthe valves of explosive engines itiswell known that continuous rotation of thevalve is objectionablefor the the sleeve andis provided with a terminal reason that the contacting surfaces of'the valve and'valve seatoften become scored by the travel of 'anoccasional' large particleof grit or emery, entirely around the valve seat.

This scoring formspockets providing a still, 7 greater capacity for collecting carbon. It is 7 therefore desirable that the; valve be merely oscillated instead of continuously rotated in order that such particles of grit may be ground and crushed before the position of the valve is materially changed.

- While this desirability is recognized, the

workman in grinding the valves by means of the usual tools, such as a brace or breast bit,

will frequently endeavor to speed the operation by continuouslyrotating the valve in stead of exercising the care and patience necessary to produce the better result by oscillating the toolfas above described. With my improved form of tool it is obviously impracticable to use it forthe purpose of imparting continuous rotation to'the bit, be-' ceause of the post 2 connecting the endsof the yoke 12 and standing in the way of the workmans arm after having moved the tool through approximately a half revolution.

It is necessary therefore, for the workman to perform his work by simply oscillating the tool, and as often as it is necessary to shift the position of the valve, he will lift the yoke or crank arm 12, and move the same to alter the relative engagement of the teeth 16 post and bit must remain stationary, and

the member 10; however, for'guarding against any possibility of the post or bit moving-at such times, the disk 4 is provided of such proportions as to be conveniently the tool may be operated with the post tilted at a slight angleto the bit where the space about the valve is limited.

In the modification shown in Fig. 3, the

a and 18. In making this change or shift the they may be so held by-pressing down upon post 2 terminates Within the sleeve 20, the latter beingleft with its lower end open to form a chuck for the stem 30 which carries the bit. This stem is provided with a tang 32 fitting in a recess 34: in the end of the post, and also with an annular groove 36 for receiving the end of a retaining screw 38 carried by the sleeve. A pin 22 secures the sleeve to the post, the same as in the form shown in Figs. 1 and 2. 7

It will of course beunderstood that the use of the device is not confined to the manipulation of valve grinding bits but that the same is well adapted for'use in other relations where the only modification necessary is in the character of the tool proper applied to the end of the post 2. While I' tremity of the post and bearing against the upper face of the disk, a sleeve provided with upwardly-projecting teeth, secured rigidly on the post, and a yoke pivoted on and projecting radially from the post between the said sleeve and disk and provided with depending teeth for engagement with the teeth of the said sleeve; said yoke being adapted for slidable movement upward on the post to Withdraw the yoke teeth from en gagement with theteeth of the sleeve.

In testimony whereof, I aflix my signature, in the presence of two witnesses.

BEN B. D11 MASTERS. l/Vitnesses:

HELEN O. RODGERS, G. Y. THORPEQ Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

